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Rifles, Reloading, Optics, Equipment
Gunsmithing
When checking bolt-lug face surface % with a sharpie...
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<blockquote data-quote="Susquatch" data-source="post: 1644203" data-attributes="member: 31264"><p>Great stuff!</p><p></p><p>Since Jim Borden's "bumps" are patented, and since they accomplish EXACTLY what the article you quote says, then I have to assume that the rifleman is describing Borden's bumps. Why they don't acknowledge that is beyond me.....</p><p></p><p>In any event, they definitely work. </p><p></p><p>All it takes are some pads or bumps on the bolt shaft body that are located behind the bolt lugs and/or in front of the bolt handle in line with the lugs. They slide along the receiver lug races without touching anything as the bolt slides back and forth and then engage the non- recessed part of the bolt raceway as the lugs are rotated into position. </p><p></p><p>It's not really that hard to machine them and it can be done without lots of fancy equipment. I have tried gluing on some pads, putting a weld puddle on the shaft in four places, silver soldering on a pad, milling out and installing thicker pads, and even hard coating the bolt body with a gob of a thick coating like ceracoat. Subsequently, the pads are simply turned on a lathe to the exact diameter of the raceway at their location therein. They could also be lapped in place. In an OEM shop, the bolt could be made with recoil lugs running the entire length of the bolt and then turned down on the lathe to the required dimension.</p><p></p><p>In any event, they are a patented design so they can't be used without a licence. More importantly, they are ugly in the simplest forms. </p><p></p><p>I find it much easier and better looking to just install a custom fit bolt.</p></blockquote><p></p>
[QUOTE="Susquatch, post: 1644203, member: 31264"] Great stuff! Since Jim Borden's "bumps" are patented, and since they accomplish EXACTLY what the article you quote says, then I have to assume that the rifleman is describing Borden's bumps. Why they don't acknowledge that is beyond me..... In any event, they definitely work. All it takes are some pads or bumps on the bolt shaft body that are located behind the bolt lugs and/or in front of the bolt handle in line with the lugs. They slide along the receiver lug races without touching anything as the bolt slides back and forth and then engage the non- recessed part of the bolt raceway as the lugs are rotated into position. It's not really that hard to machine them and it can be done without lots of fancy equipment. I have tried gluing on some pads, putting a weld puddle on the shaft in four places, silver soldering on a pad, milling out and installing thicker pads, and even hard coating the bolt body with a gob of a thick coating like ceracoat. Subsequently, the pads are simply turned on a lathe to the exact diameter of the raceway at their location therein. They could also be lapped in place. In an OEM shop, the bolt could be made with recoil lugs running the entire length of the bolt and then turned down on the lathe to the required dimension. In any event, they are a patented design so they can't be used without a licence. More importantly, they are ugly in the simplest forms. I find it much easier and better looking to just install a custom fit bolt. [/QUOTE]
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Gunsmithing
When checking bolt-lug face surface % with a sharpie...
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